Strain-insulator.



PATENTBD JULY 23, 1907.

G. AALBORG. STRAIN INSULATOR. APPLICATION FILED MAY 2, 190a.

CHRISTIAN AALBORG, OF WILKINSBURG, PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

STRAIN-INSULATOR.

Specification of Letters 1"atent. Application filed May 2,1906. Serial No. 314,856.

Patented July 23, 1907.

To all whom it may concern:

Be it known that I, CHRlSTIAN Aannone, a citizen of the United States, and a residentoi Wilkinsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Strain-Insulators, of whiclrthe following is a specification. p I

My invention relates to insulators for electrical circuits and particularly to such as are subjected to great mechanical strains. i

The object of my invention is to provide an insulator oi the character indicated that shall be simple in construction and capable of withstanding very high electrical and mechanical strains.

Figure 1 of the accompanying drawingis a transverse sectional view of an insulator constructed in accordance with my invention, the section being on line II-Il of Fig. 2, and Fig. 2 is a longitudinal sectional view of the insulator shown in Fig. 1.

A cost or forged metal block 1 is provided with an-' nulnrly arranged apertures 2, 3, 4 and 5, adjacent ones of which are tapered toward opposite faces of the block. Located within the respective apertures and protruding from the opposite sides of the block ar lrusi.o-couical insulating sleeves 6, 7, 8 and 9, and within the insulating sleeves are tapered plugs 10, ll, l2 and l3 that are screw-threaded for the reci-piion oi the ends of U-shnped bolts 14 and 15 that project into the smaller ends of the apertures from the opposite sidcs of the block 1. If desired, each of the plugs 101.013 inclusive, may be formed in two parts and the ends oi the U-shaped bolts may he provided with heads, or they may be constructed in any other suitable manner. All of said parts are embedded in insulating material that is molded into a suitable form, such as that shown, either while the insulator is subjected to tension or after it has been subjected to ten- SlOll.

The structural details and the arrangement of the parts of the insulator may be varied considerably from what has been shown and described without departing from the spirit of the invention, and I desire that all such modifications shall be included within itsshaped bolts the extremities of which project from oppositesides of "said block into the smaller ends of the apertuf'es and ure ecured to .the plugs, and means for insulat ing the plugs and the bolts from said block.

' 3. A strain insulator comprising a block having two sets of oppositely tapering apertures, plugs located therein, U- shaped bolts the extremities of which project from opposite sides of said block into the smaller ends of the'aper .tures and are secured to the plugs, and insulating sleeves that surround the plugs within the openings in the block. 4. A strain insulator comprising a block having two sets of oppositely tapering apertures, plugslocated therein, U- shaped bolts the extremities of which project from opposite sides of said block into the smaller ends of the apertures andare secured to the plugs, insulating sleeves that surround the plugs within the openings in the block, and insulating material in which are embedded all of said parts, except the curved portions of the U-shaped bolts.

5. A strain insulator comprising a block having side by side tapered apertures, insulating sleeves located within the apertures and projecting beyond the sides of the lglock, plugs located within the sleeves, and'bolts that project into the smaller ends of the apertures in the block and are secured to the plugs. v

(i. A strain insulator comprising a block having a plurnlity of side by side tapered apertures, insulating sleeves located within said apertures and projecting beyond both sides of the block, tapered plugs located within the sleeves,

bolts that project into the smaller ends of the apertures in the block and are secured to the plugs; and a single body of insulating material in which are embeddednll of said parts except the free ends of said bolts.

7. A strain insulator comprising a member having two sets of oppositely tapered apertures located side by side, insulating sleeves located within the apertures, tapered members within the sleeves, and bolts screwed into the smaller ends of the tapered members. i

S. A strain insulator comprising a member having two sets of oppositely tapered apertures,-insulating sleeves located within the apertures, tapered members within the sleeves, bolts screwed into the smaller ends of the tapered members, and a single body of insulating material in which all of said parts, except the ends of the bolts, are embedded.

9. A strain insulator comprising a block having a plurality of tapered apertures'located side by side, insulating sleeves locatedwithin the apertures, tapered plugs located within the sleeves, and bolts that project into the smaller ends of the apertures in the block and are detachnbly secured to the plugs.

10. A strain insulator comprising a block having a pinrality of tapered apertures located side by side. insulating sleeves located within the apertures, tapered plugs located within the sleeves, bolts that. project into the smaller ends of the apertures in the block and are secured to the plugs. and a single body of insulating material in which are our bedded all of said parts except the free ends of said bolts.

In testimony whereof, I have hereunto subscribed my name this 30th day'of April, 1906.

CHRISTIAN AALP-ORG.

Witnesses:

A. G. Cosmo, Binnnr HINES. 

